Anchor-drill bolt



UNITED STA-TES PATENT OFFICE.

ANCHOR-DRILL BQLT.

Specification of Letters Patent.

Patented May 24, 1921.

Application mea :me 21, 1919. serial No. 305,882.

To all whom it may concern:

Be it known that I, JOHN H. PHILLIPS, a citizen of the United States,residin at Chicago, in the county of Cook and tate of Illinois, haveinvented certain new and useful Improvements in Anchor-Drill Bolts, ofwhich the following is a description.

My invention belongs to that general Iclass of devices known as anchoror expansion bolts, and relates particularly to an anchor drill employedin the making of apertures in concrete, stone or brick for the receptionof expansion or anchor bolts, which drill may thereafter be used inconjunction with other parts as an expansion bolt.- EX- pansion bolts,sometimes termed i anchor bolts, are largely used in variousconstructions of concrete, brick, stone and other materials for thevpurpose of securely maintaining various-devices and mechanisms in@position thereon. They arelargely used on ceilings and walls for thesupport of pipe and wire systems, 4as well as mechanical and otherequipment and the like. Drills for making apertures in the walls orceilings are comparatively short lived, Athis depending of course uponthe class of material composing the wall on which the same` are used.The custom is to use a drill until it becomes too dull for furtherpractical use, when it is either discarded entirely with v a consequentloss, or in some cases` sent to the shopto be again sharpened, whichalso entails considerable expense.

My invention has among its objects the obviating of the difiicultiesabove 'mentioned and the production of a device of the kind describedwhich is simple, convenient, durable and efficient for use whereverfound applicable. More especially it relates to a drill which may beused'in the usual manin operation, the chuck being partly in section toshow its construction;

F ig. 2 is a view in elevation of a similar drlll of slightly modifiedforni;

Fig. 3 is a view in eleva-tion illustrative of a plain bolt adapted tobe used in an opening made by eitherV of said drills;

Flg. 4 is a view in elevation of a rotary drill somewhat similar to theone `shown in Fig. 1, and one method of engaging .the (sanlile with achuck adapted to rotate said Fig. 5 is an elevation partly in sectionillustrating the operation of the plain expansion or anchor bolt and thecoopera-ting parts therewith;

Fig. 6 is an elevation partly in section illustrating the use of myimproved drill as an anchor bolt, -the parts being partly in section toillustrate the operation; and

Fig.' 7 illustrates a modified form of expansion shell.

In the drawings, 1 represents a four point drill with the cutting edgesof the usual or preferred construction. The head or cutting end of thedrill is tapered at a proper' angle so that the same will operate as anexpansion or anchor bolt in copera- Y tion with the shell, as will behereafter described. The shank 2 of the drill is threaded for engagementwith a coperating coupling 21 or nut, as will also be more fullydescribed hereafter. The end of the shank 2 is preferably taperedto'engage a 'corresponding fiared or tapered recess 4 in a suitablereciprocating or percussion chuck o r member 5. This engagement permitsthe chuck to be driven longitudinally in the usual manner of apercussion chuck without in any way injuring the threads onthe shank 2,the portions being such that the drill yis firmly engaged and maintainedin the chuck without engaging and injuring the threads. In Fig. 3, 6represents` a well known type of plain bolt provided with the threadedshank 6', and it will be noted by referring to Figs. 1 and 3 that thehead' and shank of the drill substantially corresponds in shape with thehead and shank of the bolt. The drill 7 shown in Fig. 2 is a modifiedform of six point drill, which may be used in the percussion chuck shownin Fig. 1.

Fig. 4l illustrates a rotary drill 8 formed with the tapered headcorresponding with the anchor bolt and with a shank 9 threaded. In thiscase a rotary .chuck part 10 1s arranged to engage the thread on theshank of the drill so that the drill may be rotated.

VFi 5 illustrates the common typeof anchor` olt shown in Fig. 3 in placeafter. the hole has been drilled, and Fig. 6 illustrates the use of oneof the drills as an expansion or anchor bolt. Referring to Fig. 5, 6represents the expansion bolt arranged in the hole 12 drilled in thematerial 11. The sleeve .or shell 13 is shown in this case in operativeposition., it being understood that the shell is made in any desirednumber of parts or split as desired to allow expansion of the inner end.Arranged on the threaded shank 6 of the bolt is the coupling sleeve 14,which carries a rod or hanger bar 15 also threaded to engage the sleeve,and adapted for supporting whatever may be desired. In Fig. 6, 1represents the drill used as an expansion or anchor bolt extended into ahole in the material 19. Arranged on the bolt is the expansion shell 20and coupling 21 which carries the rod 22. In securing the plain bolt ordrill bolt in place, the expansion shell and bolt are in- Serted in thehole as far as the same can be forced therein, after which the couplingor threaded sleeve is positioned. The coupling tends to force theexpansion shell on the bolt, or what is the same thing, draw the boltthrough the Shell, causing the expansion shell to expand andfrictionally engage the walls of the hole, so that the bolt is securelyheld in place. The rod 22 may then be screwed in place and thesamesupport whatever is desired to be carried thereby. With the shell 16shown in Fig. 7 the same is formed with what may be termed cutting teeth17, so that the same may be driven into the hole on the bolt, and thesame at the time it is being so driven engage the walls of the hole, andto a certain extent cut a flared hole. The advantages of constructingthe drill so that it may be used as an anchor bolt are numerous.

In practical use drills, according to size, at the present time, costfrom forty cents each and upward in quantities, and in use may drill onehole or any number up to, in some cases, as many as ifty holes,depending upon the class of material to be drilled. Some types may beresharpened a limited number of times by grinding, but as a rule it isnecessary to upset, dress and retemper drills, this entails not only theexpense of redressing, but also the time'lost in getting drills to shopand back to the work, and in many cases the worked over drill isunsatisfactory unless resharpened by an expert tool dresser familiarwith the work and equipped for doing the same. The drill bolt hereinshown is designed to drill equally as many holes as the common types ofdrills above referred to and now in use, and is so designed that afterit has become too dull for further use, it may be used, with shell andcoupling or nut, as previously described, as an expansion or anchor boltin one of the holes it has drilled, and is also of such design thatplain bolts of the same general shape, and of cheaper material andconstruction, may be used with like shell and nut or coupling in theother holes which is drilled. As for example, say it is necessary to useten one-half inch expansion bolts in hanging a line of pipe to aconcrete ceiling. Vith the bolt herein described, it would be necessaryto use one one-half1 inch drill bolt and nine one-half inch plain bolts,drilling the ten holes with the drill bolt and then using it and thenine plain bolts with their shells and couplings in the ten holesdrilled. The use of this drill bolt insures the right size drills ofuniform quality at all times and obviates the expense an troubleincident to using and resharpening drills of other types.

Among the many uses to which my improved drill bolt is particularlyadapted, may be mentioned their use in connection with the drilling ofholes for the installation of automatic sprinkler systems in concretebuildings, such sprinkler systems require a number of sizes of pipewhich may vary from ten or twelve inches diameter for mains, tothree-quarter inch for laterals or branches, according to the number ofsprinkler heads and the distance from supply. For hanging or suspendingthese various sizes, correspondingly varying size eX- pansion bolts andhangers are required. The size of expansion bolts and hangers commonlyused are three-eighths, one-half, fve-eighths and three-quarter inch,these sizes referring to the diameter of the rod or hanger used forsuspending the pipe. In present practice a one thousand boltinstallation would require, assuming twenty to be the average number ofholes a drill will make before it becomes too dull for further practicaluse, one thousand expan sion bolts and fifty-one drills, consisting offour sizes to accommodate the four sizes of expansion bolts. With myimproved drill bolt the same installation would require nine hundred andforty-nine expansion bolts, of the plain bolt type previously described,and if-tyone drill bolts which would also be used as expansion boltsafter the holes are drilled, and by making the outside diameter of thethree-eighths inch shells the same as the one-half inch, and the 121'five-eighths inch the same diameter as the three-quarter inch size, onlytwo sizes of drill bolts would be used in drilling the holes for thefour sizes. This would be a saving of fifty-one bolts and would simplify13o the work in requiring only two sizes of drills, leaving no dull orbroken drills to be resharpened or lost, or hauled from job to job.

The shells for use with the drill bolts and plain bolts may be of suchdesign, material and construction as may be required or found necessary,or drill bolts and plain bolts may be used with lead or other calkingrings. While I have particularly mentioned and pointed out theadvantages of the device when used on automatic sprinkler work, thesamemay be used equally well for other kinds of work, and the drill boltmay be used as an expansion bolt in its own hole, or by varying the sizeof the shell, may be used in holes drilled with the next larger sizedrill bolt. yThis is immaterial in so far as the use of the drill boltis concerned, and depends upon the particular work in hand.

The drill may be manufactured of Inaterial suitable for the purpose andtempered or case hardened to the extent desired or found necessary. Itis found by experience that in some cases, the drill can be made of thesame material as the ordinary bolt and in a suitable bolt machine, andthen be case hardened. Of course when so constructed it does notordinarily have the life of the steel drill, but does have sulficientfor some purposes. The cost in the case of this type of drill is butlittle more than the cost of an ordinary bolt.

Having thus described my invention, it is obvious that variousimmaterial modifications may be made in the same without departing fromthe spirit of my invention; hence I o not wish to be understood aslimiting myself to the exact form, construction, arrangement andcombination of parts hereinv shown and described, or uses mentioned.

What I claim as new and desire to secure by Letters Patent is:

1. A drill bolt comprising a drill head provided with a shank, the drilltapering from adjacent the end of the head thereof to the shank, saidshank provided with a thread thereabout.

2. A drill bolt comprising a head having cutting edges at the. endthereof and tapered from the head and provided with a straight shank,said shank threaded toengage a coperating part.

A drill bolt comprising a head having cutting edges at the end thereofand tapered from the head to provide a straight free end of the same tothe shank andi formed with cutting faces at the free end,

the opposite end of the shank being tapered,-

said shank being threaded between said tapered 'end and the head, incombination with an eXpansible shell arranged on said` head end, and acoupling arranged to enga e the thread on said shank and the end o saidshell.

5. In a device of the kind described and in combination, a drill boltformed with a cutting edge at one end and tapered at the opposite end,with a threaded straight shank intermediate the ends, the cutting endof. said bolt tapered to the straight shank portion, a shell arrangedabout said blt adjacent the cutting end, and a coupling arranged toengage the threaded end of said shank and of a length to engage athreaded roc projecting thereinto from the opposite en 6. An anchordrill bolt comprising a drill provided with a tapered head adapted tocoperate with an expansion shell, and having its opposite end formed tobe 'engaged with a chuck, the shank of the bolt being screw threaded toengage a coperating part adapted to forcethe drill longitudinally in theexpansion shell.

7. An anchor drill bolt comprising a drill provided with an enlargedhead and a screw threaded shank, the shank near the end thereof beingtapered to seat within a cooperating chuck.

8. An anchor drill bolt comprising a drill provided with an enlargedhead and a screw threaded shank, said shank constructed to seat within acoperating chuck.

9. An expansion shell expanding bolt comprising a bolt provided with anenlarged head Aand having cutting means thereat, and provided with meansfor engaging a coperating chuck.

In testimony whereof, I have hereunto signed my namejn the presence oftwo sub scribing4 witnesses.

JOHN H. PHILLIPS.

Witnesses:

ROY W. HILL CHARLES I. oBB.

